fix(lib.sh): line breaks in a name become '-' like Python's; load_state_json strict (Issue #71)

- The ASCII branch of _sanitize_herdr_agent_name translates line breaks
  before sed (line by line) and $(...) (drops a trailing one) can lose
  them: "newline-creator-claude\n" was started as newline-creator-claude
  while its attach_command named newline-creator-claude-.
- `load_state_json strict` exits 1 (stderr) when the YAML or DB cannot be
  read instead of printing {}; without the argument nothing changes.

Refs #71

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/lib.sh

@@ -39,7 +39,8 @@ AGENT_SESSIONS_YAML="${AGENT_SESSIONS_YAML:-$WORKSPACE_ROOT/.mam/agent-sessions.
 # shasum, sha1sum, openssl or python3 to make it, this fails (stderr, nonzero)
 # rather than return a name herdr never registered. A name that is not ASCII
 # is lowercased and replaced by python3 (tr/sed differ from str.lower() there),
-# and fails the same way without it.
+# and fails the same way without it. Line breaks become '-' before sed (which
+# works line by line) and before $(...) could drop a trailing one.
 _sanitize_herdr_agent_name() {
   local n="$1"
   if [ -z "$n" ]; then
@@ -48,7 +49,7 @@ _sanitize_herdr_agent_name() {
   fi
   local s=""
   if [ -z "$(printf '%s' "$n" | LC_ALL=C tr -d '\000-\177')" ]; then
-    s=$(printf '%s' "$n" | tr '[:upper:]' '[:lower:]' | sed -E 's/[^a-z0-9_-]/-/g')
+    s=$(printf '%s' "$n" | tr '\n' '-' | tr '[:upper:]' '[:lower:]' | sed -E 's/[^a-z0-9_-]/-/g')
   elif command -v python3 >/dev/null 2>&1; then
     s=$(python3 -c 'import re,sys; sys.stdout.write(re.sub(r"[^a-z0-9_-]", "-", sys.argv[1].lower()))' "$n") || s=""
   fi
@@ -1590,10 +1591,14 @@ herdr() {
 # ---------------------------------------------------------------------------
 # NOTE: Retained as small inline PYEOF block (39 lines) per Plan Rev.2 (Job 98393a97).
 # Small blocks have minimal overhead and high local cohesion; extraction into lib_py is reserved for large blocks (>200 lines).
+# `load_state_json strict` (Issue #71) fails (stderr, exit 1) when the YAML or
+# DB cannot be read, instead of printing {} - for a caller that acts on a
+# session being absent.
 load_state_json() {
-  env_python "$AGENT_SESSIONS_YAML" <<'PYEOF'
+  env_python "$AGENT_SESSIONS_YAML" "MAM_STATE_READ=${1:-}" <<'PYEOF'
 import os, sys, sqlite3, json, yaml
 yaml_path = os.environ['YAML_PATH']
+strict = os.environ.get('MAM_STATE_READ') == 'strict'
 db_path = os.path.splitext(yaml_path)[0] + '.db'
 d = {}
 db_sessions = []
@@ -1605,21 +1610,25 @@ try:
             row = conn.execute('SELECT data FROM state WHERE id=1').fetchone()
             if row:
                 d = json.loads(row[0])
-        except sqlite3.OperationalError:
+        except sqlite3.OperationalError as e:
-            pass
+            if strict and 'no such table' not in str(e):
+                raise
         try:
             cursor = conn.execute('SELECT data FROM sessions')
             for r in cursor.fetchall():
                 db_sessions.append(json.loads(r[0]))
             d['herdr_sessions'] = db_sessions
-        except sqlite3.OperationalError:
+        except sqlite3.OperationalError as e:
-            pass
+            if strict and 'no such table' not in str(e):
+                raise
         conn.close()
     elif os.path.exists(yaml_path):
         with open(yaml_path) as f:
             d = yaml.safe_load(f) or {}
-except Exception:
+except Exception as e:
-    pass
+    if strict:
+        print('ERROR: cannot read the registry %s: %s' % (yaml_path, e), file=sys.stderr)
+        sys.exit(1)
 # Clean lone surrogates to prevent UnicodeEncodeError on stdout print
 def clean_surrogates(obj):
     if isinstance(obj, str):